Deda elementi deda di2 battery holderthe innovative deda battery adapter dba for seatposts offers an handy and light system for new generation of shimano di2 internal batteries the adapter fixing system fits inside your deda seatpost tube allowing safe battery installation features materialelastomer in thermoplastic rubber length70mm weight10g 27 2mmcompatible with all deda elementi seatposts with 27 2mm and 31 6mm diameterbuydeda componentsfrom chain reaction cycles the worlds l